hardinge



No. 12,320. I PATENTED MAY 8, 1855.

' ,B. HARDINGEV FACING BED FOR GRINDING ARTIFICIAL GRANITE, 8w.

, UNITED STATES all whom it may, concern a Be it known th t I,IBENJAMIN HARDINGE,

of the city of NewYork, in the county and a State of New Yorkyhave invented a new and ImprovedMachine for Facing Concrete Conglomerate, Variegated Artificial Granite, and other Hard Substances, which machine I call a Facing-Bed)? which I verily believe has not beeniknown or used before; and I do hereby declare that the following is a full and exact description thereof, referencebeing had tothe accompanying drawings and the figures and letters of reference marked thereoni 1 fl The nature of myinvention consists in constructing a round, cast iron, saucershaped dish, of about 8 feet in diameter,

calcareous ferriiginous lfrit; ground with which itis wet up into a plastic state, put 5 into said dish, and leveled with a straight edged spatula, while invery slow motion; so that,when hard,it turnsin a perfect horizontallevel, and runsas true as though it wereturned in allathe from a Hsolid. And the precautionary manner of A suspending it with the shaft which carries giving it (by heavy steel bearings) a ght vertical elasticity, prevents the turned up, A, and B, (or a saucer shape) thus forming a strong dish, which is bolted' to cast ironsupporters D; These are secured to the upright shaft E, which turns in between, and rests upon two heavy bolsters of steel in thick leaves,,F, with collars, G, as bolsters and bush for the shaft, E, to turn 3 in. The ends of these springs, F, rest upon cross pieces mortised into the beams, P, P. l There is a gudgeon at the lower end of the a 1 shaft, E, which is steel pointed, which rests and turns in and upon the socket, I, which is p, bolted to asteel bolster (also in leaves) to it afford a very slight elasticity J, which is l and filling it with concrete cement of siliciand mixed with coarse crude emery, steel turnings, sharp sand and hydrous s1l1cat'es,;,

small-f est sudden jerk1ng, common to ordinary PATENT OFFICE.

iiiiNlHARDINGE, OF NEw YORK, N. Y.

j F CI G-BED FOR GRINDING ARTIFICIAL GRANITE, 8w.

specificati n of Letters Patent No. 12,820, dated May 8, 1855.

let into the plumber-block, K. The shaft,

four-horse power of either steam, water, or horses. Having my construction so far ready I proceed to fill my dish A, and B, with concrete cement; made of silici-calcareous and ferruginous frit, ground and mixed with coarse crude emery steel turnings and sharp. sand, wet up, with hydrous silicates,vintoa plastic mass; having filled said dish, I putin very slow motion the whole machine; in order to level down the aforesaid plastic mass, with a straight edge spatula so that, whenhard, it runs in as perfect a horizontal level as if turned in a, lathe from asolid, and when perfectly consolidated and baked is ready for use.

The utility and indispensable necessity of this machine will now atonce be seen not only in facing substances so much harder than marble, and cutting them down so rapidly, (being fed with sharp sand and water in the usual manner) notwithstanding a number of blocks of artificial conglomerate composed of quartz pebbles of all, sizes oval shaped) variegated granite pav- ,ingstones,interspersed with mica and the interstices filled also with siliciousmaterials, could not be ground by any of the processes heretofore in use; and the facing is necessary to produce the beauty and effect of a sawed naturalformation, admitting that a secondary, or even a primitive formation of such beauty and hardness could be found and sawed. The finish and polish of my faced stone is by a transparent lava not here described. y I claim c 1. The above described artificial grindstone or facing-bed, consisting of a saucer shaped dish filled with a concrete of the materials specified or others substantially the same.

2. Also the suspension of the shaft, which carries the rotary facing-bed upon steel supabove set forth and described.

BENJAMIN HARDINGE.

Witnesses:

WASH R. NICHOLS, C. T. GREENE.

E, is turned by the pulley and belt L, by a a porters substantially as and for the purpose 

